Henry Livingstone Sulman, (born Jan. 15, 1861, London—died Jan. 31, 1940, Croydon, Surrey, Eng.) British metallurgist, one of the originators of the froth flotation process for concentrating ores preliminary to the extraction of metal.

After graduation from University College, London, Sulman served as chemist or manager for various chemical plants in Bristol and London. In 1898 he entered into partnership with H.F.K. Picard as metallurgical consultants in London. Sulman was the inventor or co-inventor of several processes for the extraction of gold, including treatment with cyanogen bromide, before introducing, in conjunction with Picard, the froth flotation process.

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in mineral processing, method used to separate and concentrate ores by altering their surfaces to a hydrophobic or hydrophilic condition—that is, the surfaces are either repelled or attracted by water. The flotation process was developed on a commercial scale early in the 20th century to...